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Andres, H. P.; Krämer, Karl; Güdel, Hans-Ulrich (1996). Optical absorption and luminescence spectroscopy of U3+ in K2LaX5 (X=Cl,Br,I). Physical review. B - condensed matter and materials physics, 54(6), pp. 3830-3840. American Physical Society 10.1103/PhysRevB.54.3830